1、摘 要 车载逆变器就是一种能把汽车上 12V 直流电转化为 220V/50Hz 交流电 的电子装置,是常用的车用电子用品。在日常生活中逆变器的应用也很广泛, 比如笔记本电脑、录像机和一些电动工具等。 本设计主要基于开关电源电路技术等基础知识，采用二次逆变实现逆 变器的设计。主要思路是：运用 TL494 以及 SG3525A 等芯片,先将 12V 直流 电源升压为 320V/50Hz 的高频交流电，再经过整流滤波将高频交流电整流 为高压直流电，然后采用正弦波脉冲调制法，通过输出脉冲控制开关管的 导通。最后经过 LC 工频滤波及相应的输入输出保护电路后，输出稳定的准 正弦波，供负载使用。 本设计具
2、有灵活方便、适用范围广的特点，基本能够满足实践需求。 而且本设计采用高频逆变方式，具有噪声降低、反应速度提高以及电路调 整灵活的优点。设计符合逆变电源小型化、轻量化、高频化以及高可靠性、 低噪声的发展趋势。 关键词：车载逆变器 ；脉冲调宽 ；保护电路 ；TL494 ；SG3525A； ABSTRACT Car inverter is a kind of vehicle that can be converted to 220V/50Hz 12V DC AC electronic device which is commonly used in automotive electronic pro
3、ducts. The inverter applications are very broad in the daily life , such as notebook computer, video recorder and electric tools etc. This design is mainly based on switch power supply circuit technology basic knowledge, using two inverter realize inverter design. The main idea uses the TL494 and SG
4、3525A etc chip, the first 12 V dc power boost for 320 V/frequency 50 Hz high frequency alternating current, and rectification of high frequency ac filter will rectifier for high voltage dc and then using sine pulse regulation law, through the output pulse control switch tube conduction. Finally afte
5、r LC industrial frequency filter and the corresponding input/output protection circuits, stable output prospective sine wave, used for load. The design is flexible and convenient, apply a wide range of features, can basically meet the demand of practice. Besides the design uses the high frequency in
6、verter, with noise reduction, response speed and adjust the advantages of flexible circuit. Finally the design conforms to the power supply miniaturization, lightweight, high frequency and high reliability, low noise trend. Key words: car invert ；pulse width modulation；circuit protection；TL494; SG3525A ; 山东科技大学学士学位论文 目录 目录目录 1 1 绪论绪论.1.1 1.1 车载逆变器及其发展1 1.2 逆变电源技术的发展2 1.3 逆变电源的发展趋势5 2 2 设计总体目标设计总体目标.7.7 2.1 设计要求及系统指标7 2.2 总体方案的选取8 3 3 整体电路设计整体电路设计1111 3.1 逆变电源整体框图.
